/* Reads data spanning two pages in virtual address space,
   which must succeed. */

#include <string.h>
#include <syscall.h>
#include "tests/userprog/boundary.h"
#include "tests/userprog/sample.inc"
#include "tests/lib.h"
#include "tests/main.h"

void test_main(void)
{
    int handle;
    int byte_cnt;
    char *buffer;

    CHECK((handle = open("sample.txt")) > 1, "open \"sample.txt\"");

    buffer = get_boundary_area() - sizeof sample / 2;
    byte_cnt = read(handle, buffer, sizeof sample - 1);
    if (byte_cnt != sizeof sample - 1)
        fail("read() returned %d instead of %zu", byte_cnt, sizeof sample - 1);
    else if (strcmp(sample, buffer))
    {
        msg("expected text:\n%s", sample);
        msg("text actually read:\n%s", buffer);
        fail("expected text differs from actual");
    }
}
